JP2002325456A - Circuit for controlling power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid rapid changes in the output of a power unit, even when changing the input voltage to the power unit. SOLUTION: A zero point detection circuit 21 detects the timing input AC voltage periodically reads zero. A frequency detector 22 detects the frequency of an AC power source, based on the output of the zero-point detection circuit 21. An extraction part 23 extracts a reference data, corresponding to the detected frequency from a reference data table 24. A comparison part 27 compares an output parameter of a power unit with its target value, and based on this result, the target value is updated. A coefficient calculater 28 calculates a correction coefficient, based on the target value. A correction part 25, by using the correction coefficient to correct the reference data, generates a current command value data. A pulse converter circuit 30 generates a switch control signal, corresponding to the difference component between the current command value data and an input current.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for controlling a power supply for converting power supplied from an AC power supply into power to be supplied to a load.

[0002]

2. Description of the Related Art Conventionally, a power supply device for converting electric power supplied from an AC power supply into electric power to be supplied to a load has been widely known. For example, when charging a battery using an AC power supply, the power supply device converts power output from the AC power supply into power required by the battery.

FIG. 9 is a block diagram showing an example of an existing power supply device and its control circuit. This power supply device includes a switch circuit 101 for converting power output from an AC power supply 100 into power required by a load 103, and an output circuit 102 for shaping or smoothing the output of the switch circuit 101. Then, the switch circuit 101 includes the control circuit 11
Controlled by 0.

The control circuit 110 controls the switch circuit 101 while improving the power factor of the power supply device. Specifically, a switch control signal for generating the power required by the load 103 is output while matching the phases of the input voltage and the input current of the power supply device. That is, the differential circuit 111
Calculates the difference between the output feedback value indicating the output of the power supply device and the target value of the output of the power supply device. Here, the output feedback value is, for example, the output voltage of the power supply device, the output current, or a combination thereof. On the other hand, the target value is, for example, a voltage, a current, or a combination thereof required by the load 103. The multiplication circuit 112 includes an analog amplifier such as an operational amplifier, and outputs a product of the output of the differential circuit 111 and the input voltage of the power supply device. Differential circuit 113
Outputs the difference between the output of the multiplication circuit 112 and the input current of the power supply device. The pulse generation circuit 114 includes the differential circuit 1
A pulse signal (switch control signal) for controlling the switch circuit 101 is generated based on the output of the switch 13. Then, by using this switch control signal, the switch circuit 10
By driving the power supply 1, the power required by the load 103 is generated while improving the power factor of the power supply device.

[0005]

However, in the control circuit 110 shown in FIG. 9, when the input voltage of the power supply changes, the switch control signal immediately changes in accordance with the change. Therefore, for example, when the input voltage of the power supply increases, the input current of the power supply may fluctuate rapidly following the increase, which may adversely affect the load 103.

Further, in the existing configuration shown in FIG. 9, a multiplication circuit 112 must be provided in order to realize the control circuit 110, and it is difficult to reduce the production cost. An object of the present invention is to solve the problem even when the input voltage to the power supply device fluctuates.
An object of the present invention is to provide a control circuit of a power supply device that can suppress the fluctuation of the output.

[0007]

A control circuit according to the present invention is a circuit for controlling a power supply for converting AC power supplied from an AC power supply into power to be supplied to a load, and is input to the power supply. Phase detection means for detecting the phase of the AC voltage, output detection means for detecting a parameter relating to the output of the power supply, and reference data determined in advance for controlling a current flowing through the power supply. Correcting means for correcting based on the parameters detected by the output detecting means, and generating means for generating a control signal for controlling the power supply device from an output of the correcting means according to the phase detected by the phase detecting means. Have.

In the above configuration, when the output parameter of the power supply changes, the reference data is corrected based on the change. Then, a control signal for controlling the power supply device is generated from the corrected reference data. here,
The reference data is data for controlling a current flowing through the power supply device. Therefore, the current flowing through the power supply is adjusted according to the variation of the output parameter. At this time, if the ratio of changing the reference data based on the change of the output parameter is set small, the change of the current flowing through the power supply device also becomes small. That is,
Even if the output parameters fluctuate due to fluctuations in the input voltage to the power supply, the current flowing through the power supply does not fluctuate rapidly.

Further, the control signal is generated according to the phase detected by the phase detecting means. Here, the phase detecting means detects the phase of the AC voltage input to the power supply device. Therefore, if the power supply is controlled using the control signal, the phase of the input voltage and the phase of the current (input current) flowing through the power supply can be matched. That is, the power factor is improved.

[0010] In the above configuration, storage means for storing reference data respectively corresponding to a plurality of frequencies is further provided, wherein the correction means stores the reference data corresponding to the frequency of the AC voltage input to the power supply device. You may make it correct | amend by taking out from the said storage means. According to this configuration, the load on the correction unit is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an example of a power supply device according to the present invention. In the following description, the “power supply device” includes a power conversion unit 1 that converts power and a control unit 2 that controls the power conversion unit 1, but the power conversion unit 1 may be referred to as a power supply device. .

The AC power supply 100 is, for example, a 50 Hz or 60 Hz commercial power supply supplied from a power company or the like. Rectifier circuit 11 rectifies AC power output from AC power supply 100. Here, it is assumed that rectifier circuit 11 performs full-wave rectification on AC power. Switch circuit 12
Is configured by connecting four switching elements in an H-bridge type, and controls a current (magnitude and direction) flowing on the primary side of the transformer 13 in accordance with a switch control signal provided from the control unit 2. .

The transformer 13 transfers the AC power output from the switch circuit 12 to the output terminal side and cuts off the primary side and the secondary side in a DC manner. Rectifier circuit 14
Rectifies the power output from the transformer 13. The power output from the rectifier circuit 14 is output to an output terminal 15.
To the load 103. The load 103 is, for example, a battery.

The control unit 2 generates a switch control signal for controlling the switch circuit 12 based on the input voltage Vin, the input current Iin, and the output parameters of the power supply. The input voltage Vin is an AC voltage generated by the AC power supply 100 or a voltage obtained by full-wave rectifying the AC voltage. The input current Iin is equal to the switching circuit 1
2 is the current flowing through The output parameters are the output voltage Vout and / or the output current Iout of the power supply.

The switch control signal generated by the control unit 2 is a signal for controlling the switch circuit 12 so that the output parameter of the power supply unit matches the target value. here,
The target value is basically requested by the load 103, but may be generated by the control unit 2 itself. Also,
The target value is a value indicating the output voltage and / or output current of the power supply device.

The switch control signal is a signal for controlling the switch circuit 12 so that the phase of the input current Iin matches the phase of the input voltage Vin. That is, the switch control signal is a signal having a function of improving the power factor of the power supply device. As described above, in the power supply device illustrated in FIG. 1, the output voltage and / or the output current are controlled so as to match the target value while improving the power factor.

FIG. 2 is a block diagram of the control unit 2. The control unit 2 includes a CPU and a memory for executing a software program created in advance, and a hardware circuit for processing electric signals. The zero point detection circuit 21 is, for example, a comparator having hysteresis, and compares the input voltage Vin with a set of reference voltages Vref1 and Vref2. The output of the zero point detection circuit 21 is, as shown in FIG.
When the input voltage Vin becomes lower than ref1, it changes from "L" to "H", and when the input voltage Vin becomes higher than the reference voltage Vref2, it changes from "H" to "L". Here, if a value close to zero is set as the reference voltage Vref1, the zero point detection circuit 21 can detect the timing at which the input voltage Vin becomes substantially zero. The timing at which the input voltage Vin subjected to the full-wave rectification becomes zero corresponds to “0 phase” or “π phase” of the sine wave when the output waveform of the AC power supply 100 is a sine wave. That is, the zero point detection circuit 21 substantially detects the phase of the input voltage of the power supply device.

The frequency detecting section 22 includes a zero point detecting circuit 21
, The frequency of the AC power supply 100 is detected. Specifically, the frequency of AC power supply 100 is detected based on the interval between pulses output from zero point detection circuit 21. For example, if the pulse interval is about 10 ms, it is regarded as “50 Hz”, and if the pulse interval is about 8.3 ms, “60 Hz” is considered.
z ”.

The extracting unit 23 uses the frequency detected by the frequency detecting unit 22 as a key, and
From the corresponding reference data. The reference data table 24 stores the input current Iin (that is, the switch circuit 12).
The reference data is stored in advance to control the current flowing through the reference data. In this embodiment, the reference data is a numerical sequence forming a sine curve on the time axis as shown in FIG. 4A, and the reference data table 24 stores data for a half cycle.

As shown in FIG. 4B, the reference data table 24 stores reference data for 50 Hz and reference data for 60 Hz. Then, for each frequency, a numerical sequence for forming a corresponding sine curve on the time axis is stored. That is, the reference data for 50 Hz is a data string for generating a 50 Hz sine curve, and the reference data for 60 Hz is a data string for generating a 60 Hz sine curve. In addition,
The reference data shown in FIG. 4A is data for 50 Hz.

The corrector 25 corrects the reference data extracted from the reference data table 24 by the extractor 23 to generate current command value data for determining the input current Iin. Specifically, the current command value data is generated by multiplying the reference data by the correction coefficient calculated by the coefficient calculation unit 28. Then, the correction unit 25 outputs the current command value data according to the timing of the pulse output from the zero point detection circuit 21.

The target value register 26 holds a target value required by the load 103. As described above, the target value is a value indicating the output voltage and / or output current to be generated by the power supply device. The comparison unit 27 includes a target value register 26
Is compared with the output parameter actually detected by the power conversion unit 1. Then, the target value register 26 is updated based on the comparison result.
The coefficient calculation unit 28 calculates a correction coefficient based on the target value held in the target value register 26, and
Give 5

The operations of the correction unit 25, the comparison unit 27, and the coefficient calculation unit 28 will be described later in detail. The differential circuit 29 outputs a difference between the output of the correction unit 25 and the input current Iin. Then, the pulse generation circuit 30 generates a switch control signal for controlling the switch circuit 12 based on the output of the differential circuit 29. Therefore, the current flowing through the switch circuit 12, that is, the input current Iin is
It flows so as to follow the output of the correction unit 25.

The switch control signal is, for example, PW
This is a pulse signal generated by the M (pulse width modulation) method. In this case, the duty of the switch control signal is determined based on the output value of the differential circuit 29. FIG. 5 is a flowchart illustrating operations of the correction unit 25, the comparison unit 27, and the coefficient calculation unit 28. The processing of this flowchart is repeatedly executed at predetermined intervals, for example. The functions represented by the flowchart are realized by executing a software program described in advance.

In step S1, output parameters of the power supply device are obtained. Specifically, the power converter 1 detects the output voltage Vout and / or the output current Iout. Also, the target value change amount is cleared. That is, zero is set as the target value change amount.

In step S2, the output parameter obtained in step S1 is compared with the target value stored in the target value register 26. If the output parameter matches the target value, the process proceeds to step S11; otherwise, the process proceeds to step S3.

In step S3, it is checked whether the output parameter is larger than the target value. If the output parameter is larger than the target value, in step S4,
The target value change amount is reduced by a certain value. Here, for example, the target value change amount is updated from “0” to “−1”.
On the other hand, if the output parameter is smaller than the target value, it is checked in step S5 whether the input voltage Vin is zero. That is, the power supply device is
Check to see if it is receiving power from

If the input voltage Vin is zero, step S
At 6, the target value is set to zero. On the other hand, if the input voltage Vin is not zero, in step S7, the target value change amount is increased by a certain value. Here, for example, the target value change amount is updated from “0” to “+1”.
If the target value has been updated in step S6, the result is written to the target value register 26.

In step S11, the zero point detection circuit 21
It is determined whether or not the zero point of the input voltage Vin has been detected based on the output of (1). If a zero point is detected, step S12 is executed. In step S12, first, the target value held in the target value register 26 is updated. Specifically, when step S4 is executed,
“1” is subtracted from the held target value. on the other hand,
When step S7 is executed, “1” is added to the held target value. When it is determined in step S2 that the target value matches the output parameter, and when step S6 is executed, the value held in the target value register 26 is not changed. Subsequently, a corresponding correction coefficient is calculated based on the updated target value. The correction coefficient is, for example, a numerical value from 0 to 1 and is a value proportional to the target value. When both the target value of the output voltage and the target value of the output current are used as the target values, the correction coefficient is calculated based on, for example, the product of them (that is, the target power).

In step S13, the reference data extracted from the reference data table 24 is multiplied by a correction coefficient. Here, the reference data is, as shown in FIG.
It is composed of a plurality of numerical values corresponding to each timing of the time Tn. Therefore, in this process, each numerical value of the data string constituting the reference data is multiplied by the correction coefficient. For example, reference data = 0, 6, 1
0,. . . When the correction coefficient is 0.5, the correction result = 0, 3, 5,. . . Is obtained. In addition,
The data string obtained in step S13 is
5 is the current command value data output from FIG.

In step S14, the data string (current command value data) created in step S13 is sequentially output. At this time, the output of this data string is started at the timing when the rising edge of the pulse output from the zero point detection circuit 21 appears. Specifically, the AC power supply 100
Is 50 Hz, and the reference data is composed of 20 numerical values, the first numerical value of the data sequence corrected in step S12 is output at the timing of the pulse, and thereafter, 0.5 m Subsequent numerical values are output every second.

As described above, the correction unit 25, the comparison unit 27, and the coefficient calculation unit 28 update the target value based on the comparison result between the output parameter and the target value, and perform the reference based on the updated target value. The data is corrected, and the corrected reference data is output as current command value data.

In the embodiment shown in FIG. 5, the target value is updated at the timing when the zero point detection circuit 21 detects the zero point of the input voltage Vin. However, the present invention is not limited to this configuration. is not. That is, the target value may be updated as needed. Hereinafter, specific examples will be described. Here, it is assumed that the output voltage Vout of the power supply device is used as the output parameter. It is also assumed that the target value required by the load 103 is 50v, and the correction coefficient when the target value is 50 is 0.8.

Steps S4, S6 and S7 are not executed during a period when the output voltage Vout is held at 50V, that is, a period when the external parameter matches the target value, so that the target value remains at 50V. Therefore, in this case,
The correction unit 25 multiplies each numerical value constituting the reference data by a correction coefficient (0.8), and outputs the result as current command value data. As a result, the current command value data becomes a data string representing a sine curve obtained by reducing the amplitude of the sine curve represented by the reference data to 80% thereof. Then, a difference between the current command value data and the input current Iin is generated in the differential circuit 29, and a switch control signal corresponding to the difference is generated. Therefore, the input current Iin is an alternating current corresponding to a sine curve obtained by reducing the amplitude of the sine curve represented by the reference data to 80%.

In the above state, it is assumed that the input voltage Vin fluctuates for some reason and the output voltage Vout exceeds the target value. In this case, the process of step S4 in the flowchart of FIG. 5 is executed, and the target value is updated from “50” to “49”, for example. At this time, the correction coefficient corresponding to the updated target value is set to “0.
784 (= 0.8 × 49 ÷ 50) ”is obtained. Then, each numerical value constituting the reference data is multiplied by a correction coefficient (0.784), and the result is output as current command value data. As a result, the current command value data becomes a data string representing a sine curve obtained by reducing the amplitude of the sine curve represented by the reference data to 78.4% thereof. Therefore, in this case, the input current Iin is
78. Set the amplitude of the sine curve represented by the reference data to 78.
An alternating current corresponding to a sine curve reduced to 4% is obtained.

Subsequently, if the output voltage Vout is higher than the target value even though the target value has been reduced to "49", the process of step S4 is executed again, and the target value becomes "49". "To" 48 ". At this time,
As the correction coefficient corresponding to the updated target value, “0.76
8 (= 0.8 × 48 ÷ 50) ”is obtained. Then, each numerical value constituting the reference data is multiplied by a correction coefficient (0.768), and the result is output as current command value data. As a result, the current command value data is
Let the amplitude of the sine curve represented by the reference data be 7
This is a data string representing a sine curve reduced to 6.8%. Therefore, in this case, the input current Iin is an alternating current corresponding to the sine curve obtained by reducing the amplitude of the sine curve represented by the reference data to 76.8%.

FIG. 6 is a diagram showing an example of the input current controlled by the control unit 2. As described above, the input voltage Vin
Is stable, the input current Iin is 80% of the reference value.
It has a percentage of alternating current. Also, the input voltage V
When the output parameter fluctuates due to the fluctuation of in or the like, the target value changes accordingly, and the current command value data also changes. Then, the input current Iin changes according to the current command value data. At this time, the target value is updated so as to change little by little. In the above-described example, the value is changed by “1” at every “50” given as the default value. Therefore, the current command value data does not suddenly change, and as a result, the input current Iin does not suddenly change. In this example, the input current Iin
Are gradually decreasing, such as 80 percent, 78.4 percent, and 76.4 percent. Further, since the current command value data does not directly follow the input voltage Vin, when the input voltage changes, the input current does not suddenly change due to the change.

Next, the function of adjusting the phase of the current command value data will be described. As described above, the current command value data is a data string that forms a sine curve on the time axis, and is output in synchronization with the input voltage Vin. In particular,
The output of the data string constituting the current command value data is started in synchronization with each timing when the input voltage Vin periodically becomes zero. Here, the timing at which the input voltage Vin becomes zero is represented by the rising edge of the output of the zero point detection circuit 21, as described with reference to FIG. Therefore, the correction unit 25 starts to output a data string constituting the current command value data every time a rising edge of the output of the zero point detection circuit 21 is detected.

The time for outputting one set of current command value data is basically set to the same value as the cycle of the AC power supply 100 or half the time. However, since this output time is generated by the control unit 2, the output time may slightly deviate from the cycle of the AC power supply 100. Therefore, if this deviation accumulates, the phases of the input voltage Vin and the input current Iin will not match.

Therefore, the correction unit 25 adjusts the phase of the current command value data using the output of the zero point detection circuit 21. For example, as shown in FIG. 7A, when the output of one set of current command value data is completed before receiving the rising edge of the output of the zero point detection circuit 21, the next current command value Without outputting data, it outputs "zero" until the rising edge is received at time T1. When the rising edge is detected, the output of the next current command value data is started. On the other hand, as shown in FIG. 7 (b), when the rising edge of the output of the zero point detection circuit 21 is received at time T2 before the output of one set of current command value data, the data not output And the output of the next current command value data is started.

In the above process, the rising edge of the output of the zero point detection circuit 21 is synchronized with the output of the AC power supply 100. Therefore, the phase of the current command value data is adjusted by the correction unit 25 so as to match the output phase of the AC power supply 100, and the phase of the input current Iin also matches the output phase of the AC power supply 100 according to the current command value data. It is adjusted to. Therefore, the input voltage Vin and the input current Iin
Are controlled so that their phases coincide with each other. That is,
The power factor of the power supply can be improved.

In the above-described embodiment, a method has been described in which the output parameter is stabilized by changing the target value when the output parameter deviates from the target value. However, the present invention is not limited to this. . For example, as shown in the flowchart of FIG. 8, when the output parameter deviates from the target value, the correction coefficient may be directly changed.

The sequence of the flowchart shown in FIG. 8 is basically the same as the sequence of the flowchart shown in FIG. 5, except that the process of changing the target value based on the result of comparison between the target value and the output parameter is executed. Not done.
That is, in the processing of the flowchart shown in FIG. 8, when the output parameter is larger than the target value, the correction coefficient is reduced by a certain value in step S21, and when the output parameter is smaller than the target value, step S21 is performed.
At 23, the correction coefficient is increased by a certain value. Also,
If the input voltage is zero, zero is set as the correction coefficient in step S22. And step S
At 12, the reference data is corrected using the updated correction coefficient.

In the embodiment shown in FIG. 5, the change width of the target value is "1", and in the embodiment shown in FIG. 8, the change width of the correction coefficient is "constant value". Basically, it should be a relatively small value. The reason is as follows. That is, if these change widths are made unnecessarily large, when the output parameter fluctuates, the input current Iin fluctuates rapidly following the fluctuation, resulting in the problem of the prior art. . Therefore, it is desirable that the change width is set to a value within the range of the upper limit value / lower limit value such that the input current Iin does not fluctuate rapidly due to the fluctuation of the output parameter. Here, the “upper limit value” is an upper limit value of the change amount when the target value or the output coefficient is increased, and is a positive value. On the other hand,
Is a lower limit value of the amount of change when the target value or the output coefficient is reduced, and is a negative value.

However, the absolute values of the upper limit and the lower limit are
They may be the same or different from each other. Further, the lower limit value does not necessarily have to be set.
Further, in the above-described embodiment, the configuration in which the AC power is output is shown. However, the present invention is not limited to this, and a configuration in which the DC power is output may be used.

[0046]

According to the present invention, even if the AC input voltage to the power supply device fluctuates, it is possible to prevent the output from fluctuating rapidly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit diagram of an example of a power supply device according to the present invention.

FIG. 2 is a block diagram of a control unit.

FIG. 3 is a diagram illustrating an operation of a zero point detection circuit.

4A is an example of reference data, and FIG. 4B is an example of a reference data table.

FIG. 5 is a flowchart illustrating operations of a correction unit, a comparison unit, and a coefficient calculation unit.

FIG. 6 is a diagram illustrating an example of an input current controlled by a control unit.

FIG. 7 is a diagram illustrating an operation of adjusting the phase of current command value data.

FIG. 8 is a flowchart illustrating operations of a correction unit, a comparison unit, and a coefficient calculation unit according to another embodiment.

FIG. 9 is a block diagram of an example of an existing power supply device and its control circuit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 power conversion unit 2 control unit 12 switch circuit 21 zero point detection circuit 22 frequency detection unit 23 extraction unit 24 reference data table 25 correction unit 26 target value register 27 comparison unit 28 coefficient calculation unit 29 differential circuit 30 pulse conversion circuit 100 AC Power supply 103 load

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiki Sakata 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Masanori Tsuzuki 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. F-term in Toyota Industries Corporation (reference) 5H006 AA02 CA01 CA07 CA12 CA13 CB01 CC02 DA02 DA04 DB01 DB07 DC02 DC04 DC05 5H730 AA18 AS01 BB27 BB57 CC01 CC04 DD02 EE04 FD01 FD11 FD31 FD41 FF09

Claims (10)

[Claims] 1. A circuit for controlling a power supply device for converting AC power supplied from an AC power supply to power to be supplied to a load, comprising: a phase detecting means for detecting a phase of an AC voltage input to the power supply device; An output detection unit that detects a parameter related to an output of the power supply device; and a reference data predetermined for controlling a current flowing through the power supply device based on the parameter detected by the output detection unit. A control circuit, comprising: correction means for correcting; and generation means for generating a control signal for controlling the power supply device from an output of the correction means in accordance with a phase detected by the phase detection means. 2. The control circuit according to claim 1, wherein the reference data is at least a part of a numerical sequence forming a sine curve on a time axis. 3. The control circuit according to claim 1, further comprising storage means for storing reference data respectively corresponding to a plurality of frequencies, wherein said correction means is input to said power supply device. Reference data corresponding to the frequency of the AC voltage is taken out of the storage means and corrected. 4. The control circuit according to claim 1, wherein the control signal generated by the generation unit is a pulse signal for controlling a switch circuit included in the power supply device. 5. The control circuit according to claim 1, further comprising current detection means for detecting a current flowing through said power supply device, wherein said generation means includes an output of said correction means and said current detection. The control signal is generated based on a difference from the current value detected by the means. 6. The control circuit according to claim 1, wherein the correction means executes the correction when a predetermined phase is detected by the phase detection means. 7. The control circuit according to claim 1, wherein the correction unit compares the parameter detected by the output detection unit with a target value of the parameter, and determines the target value according to the comparison result. A function for changing the reference data based on the changed target value; and setting a maximum value of a change width when increasing the target value. 8. The control circuit according to claim 7, wherein a maximum value of a change width when the target value is reduced is set. 9. The control circuit according to claim 1, wherein the correction unit compares the parameter detected by the output detection unit with a target value of the parameter, and changes a correction coefficient according to the comparison result. In addition, a function of correcting the reference data based on the changed correction coefficient is provided, and a maximum value of a change width when increasing the correction coefficient is set. 10. An input terminal connected to an AC power supply, a switch circuit for converting AC power supplied from the AC power supply to power to be supplied to a load based on a control signal, and an output of the switch circuit. An output terminal, a phase detecting means for detecting a phase of an AC voltage applied to the input terminal, an output detecting means for detecting an output parameter obtained at the output terminal, and for controlling a current flowing through the switch circuit. Correction means for correcting predetermined reference data based on a parameter detected by the output detection means, and an output from the correction means to be provided to the switch circuit according to a phase detected by the phase detection means. A power supply device comprising: a generation unit configured to generate a control signal.